I had the same problem for a couple of weeks. I think I fixed it by going on Snort and manually following them then unfollowing
Discussion
Actually the problem isn’t fixed, I always see every post by nostr:npub1nym2200088t397yx43lza4gfec3rk56gxnwjnk2u4w5ld0qpau6sskc7fq despite not following.